U.S. patent application number 10/522422 was filed with the patent office on 2006-06-22 for heating element.
Invention is credited to Silvia Bader.
Application Number | 20060131004 10/522422 |
Document ID | / |
Family ID | 7973431 |
Filed Date | 2006-06-22 |
United States Patent
Application |
20060131004 |
Kind Code |
A1 |
Bader; Silvia |
June 22, 2006 |
Heating element
Abstract
The invention relates to a heating element comprising a base
body (4) made of metal, preferably aluminum or stainless steel, the
surface (10) of which is highly polished and corrosion
resistant.
Inventors: |
Bader; Silvia; (Munich,
DE) |
Correspondence
Address: |
HOOKER & HABIB, P.C.
100 CHESTNUT STREET
SUITE 304
HARRISBURG
PA
17101
US
|
Family ID: |
7973431 |
Appl. No.: |
10/522422 |
Filed: |
July 28, 2003 |
PCT Filed: |
July 28, 2003 |
PCT NO: |
PCT/DE03/02536 |
371 Date: |
September 12, 2005 |
Current U.S.
Class: |
165/133 |
Current CPC
Class: |
Y10T 29/4935 20150115;
Y10S 165/904 20130101; F28F 19/06 20130101; Y10S 29/904 20130101;
F28F 21/088 20130101; F28D 2021/0036 20130101; Y10T 29/49 20150115;
F28F 19/02 20130101; F28F 13/18 20130101; F28F 21/084 20130101;
F28D 1/05316 20130101 |
Class at
Publication: |
165/133 |
International
Class: |
F28F 19/02 20060101
F28F019/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 26, 2002 |
DE |
202 11 325.6 |
Claims
1. A heating body with a base body (4) constructed of metal,
especially aluminum, therein characterized, in that the surface
(10) of the base body (4) has a degree of reflectance of
approximately 80% to 100%.
2. A heating body in accord with claim 1, therein characterized, in
that the surface (10) is mechanically ground, in particular by,
respectively rough grinding, grinding, fine grinding i.e.
prepolishing, then mechanically polished and chemically
polished.
3. A heating body in accord with claim 2, therein characterized, in
that the surface (10) is electrochemically anodized that is,
treated with Eloxan.
4. A heating body in accord with claim 2, therein characterized, in
that the surface (10) possesses a coat of clear lacquer.
Description
[0001] The invention concerns a heating body in accord with the
principal concept of Claim 1.
[0002] Heating bodies are generally constructed of a base body of
unalloyed steel with a surface coating, in order to attain certain
desirable coloration appearances. In this practice, depending upon
the location of the said heating body, different coating procedures
are used. Thus it is possible, for example, that heating bodies in
residential areas are provided with a powdery coating or they may
be lacquered. Most likely a heating body in a bathroom can be
electrically chromed.
[0003] The above described procedures and materials have the
disadvantage, that the surface coating negatively affects the
heating capacity of a steel heating body. Thus, for example, an
electrically chromed, steel heating body, as compared to a
lacquered or powder covered steel body, will yield only 20 to 30%
as much heat. This poor rendition of heat from chrome covered steel
heating bodies results in the construction of very large heating
bodies, which in turn, each disadvantageously require a large space
allotment.
[0004] The purpose of the present invention is to create a heating
body with a similar, highly reflective surface, which resembles a
chromed heating body, which sets aside the above named
disadvantages and is further, simple and economical to produce.
[0005] This purpose is achieved by a heating body with the features
of claim 1.
[0006] The heating body in accord with the invention has a base
body of metal, especially aluminum. The surface of the said
invented base body is worked in such a manner, that a conventional
electrically applied chrome coating or gilding, for the purpose of
and bringing about a highly reflective surface, can be eliminated.
Instead of aluminum, it is also possible to make use of any other
metal, such as, for instance, a highly refined steel.
[0007] In accord with the invention, the surface is then of high
polish and possesses a degree of reflectivity of 80% to 100%.
[0008] Because of the aluminum, that is to say a metallic, base
body and the elimination of the electrical chrome application, the
invented heating body has a substantially greater thermal
efficiency than does the conventional chromed, steel heating body.
Thus, a conventional heating body, which possesses a chromed
coating, when compared to an invented, highly polished heating body
constructed of aluminum, exhibits a thermal efficiency which is
about 30% to 40% less. In other words, the invented heating body,
when operating at the same heating load, can clearly be made
smaller and less expensively. This is a considerable advantage in
bathrooms with predominately less available space.
[0009] For the achievement of the desired degree of burnish, the
metal construction of the invented heating base body is
mechanically ground, mechanically polished and chemically and
electrochemically polished.
[0010] One embodiment of the invented heating body advantageously
possesses, for the purpose of increasing the resistance to
corrosion and for the retention of the high degree of burnish, an
Eloxal coating.
[0011] Another embodiment provides, for the increase of resistance
to corrosion, and for the retention of the high degree of burnish,
a clear lacquer coating.
[0012] Intrinsically, known heating bodies with an aluminum base
body are often chromed for the purpose of creating a highly
reflective surface, which requires not only a complicated procedure
and is expensive, but further, notably reduces the emission of
heat.
[0013] Other advantageous designs are the subject of further
subordinate claims.
[0014] In the following, the invention is more closely described
with the aid of an illustrated presentation of a preferred
embodiment.
[0015] FIG. 1 shows a perspective view of an invented heating
body.
[0016] The invented heating body 2 has a base body 4 and two
connection fittings 6, 8 connecting respectively to an inlet line
for water supply and to an outlet line for the removal of the used
water. The external inlet and outlet lines are not shown. The base
body 4 has two parallel running tubes 12, 14, which are distanced
from one another by the crossover tubes 16. With this arrangement,
the water can flow between the two tubes 12, 14, so that, for
example, hand towels (not shown) can be hung on the crossover tubes
16 to be dried.
[0017] In accord with the invention, the base body requires no
surface coating for the attainment of the desired degree of
reflectivity, but rather the surface is worked in such a manner,
that both the aesthetic total impression of the heating body 2 is
increased and the base body is also protected against corrosion and
damage.
[0018] In a preferred embodiment, the surface possesses a degree of
reflectivity of 80% to 100%.
[0019] As an aid for the judgment of the luster of the finish, a
reflectometer is applicable, which is in accord with DIN 67
530.
[0020] An essential advantage of the invented heating body 2 is,
that in comparison to conventional chromed steel heating bodies, it
possesses an improved degree of heat transfer. For example, of a
chromed heating body, the statement is made, that a heat load of
some 750 W is developed. Contrary to this, an equally sized
aluminum heating body 2 develops a heating load of about 1100 W.
That is to say, the invented heating body 2 possesses, size for
size, about a 50% greater heat production, whereby its high heat
transfer capability permits a quicker reaction for the input and
output control, such as, for example, might be called for by
thermostatic regulation. Such an advantage can markedly reduce the
heating costs.
[0021] The metal base body 4 of the heating body 2, in keeping with
the invention, is mechanically ground for the achievement of the
desired degree of reflectivity, then mechanically polished and
chemically (electro-chemically) brought to a high reflectivity.
[0022] The mechanical abrasive treatment is mostly done by rough
grinding for the removal of gross protrusions and depressions of
the surface 10. This is generally carried out by a grinding disk.
In general dry grinding is employed, whereby the circumferential
speed is held to within a range of 420 to 1200 RPM.
[0023] After the rough grinding, then a secondary grinding takes
place. For this operation, advantageously, a grinding disk
arrangement is again used wherein the laminated disks are
impregnated with special clay. The 60 to 120 mesh clay is
impregnated into a fabric which can be of cloth, sheepskin, or
muslin. The disks may turn within a range of 1500 to 1800 RPM.
However, even a rotation speed up to 3000 RPM may be used.
[0024] Subsequent to the secondary grinding, fine abrasive
treatment takes place. This can also be known as pre-polishing.
Normally, the disks for this purpose, as described above, can be of
felt, sheepskin or bias cut muslin fabric with impregnated 100 to
200 mesh clay. The operation is cooled by air flow. The
circumferential speed lies somewhere in the ranges as given above,
although it may be slightly increased.
[0025] After the mechanical grinding, the surface 10, for the
removal of abrasion traces, and for the acquiring of a luster, is
similarly mechanically treated, this time with a polishing disk.
The polishing disk possesses more laminations, preferably of loose
or battened cotton material and turns at some 2000 to 2600 RPM.
This polishing is optionally carried out dry or wet. In order that
the hardness of the polishing disk may be changed, it is possible,
that among other changes of a fiber count of the cotton material,
also cloth, wood or paper insertions may be interposed between the
individual disks.
[0026] Care must be taken, in regard to the mechanical polishing of
the invented heating body, that, in particular, no metal
particulate are to be allowed to adhere to the polishing disks,
since such inserts, without fail, lead to a lessening of the
surface quality.
[0027] Fundamentally, attention must be given during the mechanical
grinding and polishing, that no excessive temperatures are
generated and no gouging of the surface takes place. A protection
of such temperature can be brought about, for the safety of the
surface, by an appropriate choice of the speed of rotation,
pressure of the abrasive means, as well as by means of proper
design of the said disks or by the use of abrasive or polishing
means such as greases, oil or pastes.
[0028] By the employment of abrasive and/or polishing means, the
impingement of these materials in the surface 10 is to be avoided,
since such embedded materials can be released during the next
process step and thus impair the quality of the surface 10.
[0029] Further, in a case of large heating bodies 2 with greater
surfaces 10, it can be of advantage, to replace the grinding disks
with abrasive belts.
[0030] For the achievement of a final luster, the surface 10 is
treated, after the mechanical phase, chemically or
electrochemically. Preference is given to the chemical treatment,
since such a procedure, counter to the electrochemical method, such
as, for instance, the Erft-works process has the advantage, that no
electrical energy is required. In this way, instead of electrical
current, oxidizing agents are used.
[0031] Advantageously, the surface 10 is finally electrochemically
anodized, or treated with Eloxal, so that the resistance to
corrosion of the said surface is increased by an Eloxal-coating.
This is especially valuable, if the heating body 2 is to be used in
rooms subject to high humidity, such as, for example, bathrooms or,
as mentioned above, the heating body is to be used for the drying
of towels.
[0032] By the above, the surface 10 is chemically changed, so that
a porous aluminum oxide layer is formed, which is still to be
sealed in a final step of the process.
[0033] It is also possible, that the surface 10, instead of being
coated with the Eloxal layer, receives a finish of a clear lacquer
for the increase of the resistance to corrosion. In this case, the
lacquer coating can be applied by spraying, or in the form of a
powder, or by means of a fine brush, or the lacquer can be applied
by dipping into a immersion bath.
[0034] Disclosed is a heating body with a base body of metal,
preferably aluminum or high quality steel, the surface of which, is
caused to be of high reflectivity and resistant to corrosion.
REFERENCE NUMBERS AND CORRESPONDING COMPONENTS
[0035] 2 Heating body [0036] 4 Base body [0037] 6 Connection
fitting [0038] 8 Connection fitting [0039] 10 Surface [0040] 12
Parallel tube [0041] 14 Parallel tube [0042] 16 Crossover
tube(s)
* * * * *